http://benheck.com/04-05-2009/commodore-64-original-hardware-laptop
I know some people make jokes about an Amiga laptop, but check the link. Somebody made a nice C64 laptop.
1 It looks like a $1 toy not any Commodore
2. It's as much a laptop as the SX64 (ie it has no batteries so it isn't a laptop at all just an all-in-one inc screen)
I have asked many times on various forums how the hell do you get the required negative voltages needed to run an Amiga/C64 motherboard to a deafening....silence lol
The battery section is one of the most critical elements to turn 80s tech into 2000s tech that uses batteries, he hasn't solved any problems a kid in shop class can't solve IMO.
If you give me a 3D printer I can make you a laptop that isn't a real laptop (ie like that) out of the 1200 and C64, as bought on ebay on a daily basis, by tomorrow, the rest of it is trivial to be honest.
(his other stuff is great but this mod he did is a complete let down and underwhelming electronically speaking IMO)